Boiler compound.



"iron.

MAX BECKER, 01* MAX N lzIEIM, G ERl-IANY.

BOILER COMPOUND.

Specification of Letters iatent.

Patented Dec. 29, 1908.

Application filed February 29, 1908. Serial No. 18,529.

To all whom it may concern:

Be it known that I, MAX BECKER, subject of the German Emperor, residingat Mannheim, Germany, have invcntednew and useful. Improvements inBoiler Compounds, of

which the following is a specification.

The present invention relates to means for preventing incrustation inboilers and for o'osening scale which is already present in boilers.Many means have already been proposed for the same purpose; none ofthese lad the desired effect however, and besides having some goodresults they were so injurious-in other respects that they couldnot beemployed in practice. For example methods have been known according towhich waste metal was to be pi't into the boiler for exercisingcleansing action on the sides of the boiler. In a similar manner it washoped that by means of triturated mix tures of sand, glass, wood orpieces of pumicer stone freshly deposited scale would be me chanicallyremoved. As a matter of fact these means had a very injurioi's effect,since they settled down and burned together with the loosenedmud andthus partly stopped up the valves and pipes or were carried away intothe steam engines. it has also been proposed to put graphite mixed withthe most different fatty materials into the boiler. As the graphite wasmechanicallybound it alone could exercise absolutely no favorableaction, whereas on the other hand the fatty admixturcs have proved veryinjuriors, as is well known.

In accordance with the present invention the new means consists of amixture of about to ground pumice-stone, about 2-,- to finely dividedaluminium and-about {5, to graphite.

The mlxture may for example be comosed as follows z ground pumice-stone8%, nely divided aluminium 5%, graphite 8'7 The dry constituents aremixed Well and ut-into the boiler. Each time the boiler is led only asmall quantity of the means is necessary. As the means does not dissolveor otherwise chemically change in the boiler,

it becomes unusable in time only by it being gradually diluted too muchwith boiler scale in consequence of the heating and, as t in the form ofmud. Also a partof it particularly the gralplnte forms a smooth coatingon the sides of t 1e boiler, which latter in this manner remaln blackand free from lncrusta tion as if the iron were. quite new.

vlf the boiler alread. contalns scale when 'the means is employeu themeans causes the scale or fur to fall from the sides s, which action isexplained as follows: \Vhen the goiler is at full pressure the metal,expands 1c incrrstation does not expand, cracks are prol-..C(l thereinand the compound fills said cracks and prevents their closure when themetal of the boiler cools. In this way the.

""incrustation is detachcd from the sidcsof the boiler.

The new means possesses the further ad'- vantage that it also preventsall formation of rest in the boiler, and when. such exists tends toprevent it increasingor entirely prevents the same. I The means hasalready proved satisfactory in varioi practical tests made with it. It

also distinguished in addition to the circumstances already mentionedparticularly by it bcinp npproximatcly free from acid and therefore notallot-king the boiler.

What i claim as my invention and desire to secure by Letters Patent isl.= The lwrcindcscribcd compound for prevening' incrrslntion in boilersand for loosening existing boiler scale, consisting of graphite,pumice-stone and aluminium, subslantially as described.

2. The hercimlcscribcil compound for prcventing; incruslation in boilersand for loos-l .cning existing boiler-scale, consisting of

